<==o †TritylodontoideaCope, 1884 [taxonomic history]
   |--o †Diademodontidae
   |  |--o †Diademodon Seeley, 1894 [Cragievanus Brink, 1965; ?Cynochampsa Owen, 1859; Gomphognathus Seeley, 1895; Protacmon Watson, 1920; Sysphinctostoma Broili & Schroeder, 1936]
   |  |  |?- †D. entomophonus
   |  |  |?- †D. mastacus Seeley, 1895
   |  |  |?- †D. grossarthi (Broli & Schroeder, 1935)
   |  |  |?- †D. polyphagus
   |  |  |-- †D. rhodesiensis Brink, 1963
   |  |  |-- †D. platyrhinus (Broom, 1919) [Cyclogomphodon platyrhinus Broom, 1919]
   |  |  `-- †D. tetragonus Seeley, 1894 [incl. Cragievarus kitchingi Brink, 1965; Cynochampsa laniaria Owen R, 1859; Trirachodon browni Broom R, 1915]
   |  |?-o †Ordosiodon Sigogneau-Russell & Sun, 1981?
   |  |  |-- †O. lincheyuensis (Young, 1961) [Ordosia lincheyuensis Young, 1961?]
   |  |  `-- †O. youngi (Hou, 1979) [Ordosia youngi Hou, 1979]
   |  `-- †Titanogomphodon crassus Keyser, 1973
   `--+?-o †Trirachodontidae Romer, 1967
      |  |?- †Silphedocynodon gymnotemporalis Brick, 1951 [juveline Trirachodon??]
      |  |?- †Sinognathus gracilis Young, 1959 [non Sinognathus Fan & Li, 1995, a mite (Arthropoda: Chelicerata: Arachnida: Acari)]
      |  |?- †Neotrirachodon expectatus Tatarinov, 2002 [Antecosuchus ochevi (in partim)]
      |  |--o †Trirachodon Seeley, 1895 [Triachodontoides Broom, 1932]
      |  |  |-- †T. sp. [Cynognathus zone A]
      |  |  `-- †T. berryi Seeley, 1895 [incl. †Inusitatodon smithi Brink & Kitching, 1953; Trirachodon kannemeyeri Seeley, 1895 (in partim); Trirachodon minor Broom, 1905] [Trirachodontoides berryi (Seeley, 1895) Broom, 1932]
      |  `--+-- †Cricodon metabolus Crompton, 1955
      |     `-- †Langbergia modisei Abdala, Neveling & Wellman, 2006 [Trirachodon kannemeyeri (in partim)]
      |-- †Traversodontidae von Huene, 1936 [= Huene, v. Huene]
      `-- †Tritylodontidae Cope, 1884

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